graphene-django 3.1.2 on Python PyPI

What's Changed

Fix linting issues by @firaskafri in #1412
Set pypi GH action version to release/v1 by @kiendang in #1415
Correct schema write test by @kiendang in #1416
Fix graphiql explorer styles by including official CSS, and update local example app for testing by @sjdemartini in #1418
Add check for serializers.HiddenField on fields_for_serializer function by @sezginacer in #1419
CI: add Django 4.2 by @dulmandakh in #1420
remove JSONField compat by @dulmandakh in #1421
CI: remove Django 4.0 by @dulmandakh in #1422
Update compat.py MissingType results after PGJSONField removal by @sjdemartini in #1423

Full Changelog: v3.1.1...v3.1.2